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Semiconductor device and testing apparatus thereof

Image Number 15 for United States Patent #5828258.

A tester is connected to a signal output terminal provided in a DRAM chip, and a frequency of a clock signal output from an internal timer is monitored. The frequency of the clock signal is varied by changing the combination of 3 bit signals, so as to obtain signals by which the frequency closest to the set value is obtained. A fuse in the internal timer is disconnected to set the frequency of the clock signal so as to obtain the same state as in the case where that signal is applied.

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